8941199580 8983350390 ISUZU Rear Leaf Spring Bumper (Auxiliary Spring) For ELF NKR NPR NQR 700P

The Rear Leaf Spring Bumper (also known as auxiliary spring, suspension bump stop, rebound bumper, overload cushion, or suspension buffer) is a critical component of the rear suspension system on ISUZU medium-duty trucks. This rubber buffer is mounted on the chassis frame above the rear axle leaf springs. Its primary function is to absorb impact when the suspension compresses fully under heavy loads or large road bumps, preventing metal-to-metal contact between the axle and chassis frame .

This leaf spring bumper ,OE cross reference: 8983350390, 8972543870, 2801530-15, 8-98335039-0, 8-97254387-0,is specifically designed for ISUZU ELF, NKR, NPR, NQR, and 700P series trucks – widely used for cargo transport, delivery services, commercial fleets, and municipal applications worldwide. These trucks are frequently operated at or near maximum gross vehicle weight (GVWR), making the auxiliary spring bumper a critical wear item .Choose from 3 quality levels – China ISUZU (Qingling) Quality / Famous Brand Aftermarket Quality / Japanese ISUZU Quality

Step	Procedure
1	Raise the rear of the vehicle and secure on jack stands
2	Support the rear axle with a floor jack to relieve stress on the bump stop
3	Locate the auxiliary spring bumper on the chassis frame above the rear axle
4	Remove the mounting bolt(s) securing the old bumper to the bracket
5	Remove the old, worn bumper
6	Clean the mounting bracket surface of rust and debris
7	Position the new bumper on the mounting bracket
8	Apply anti-seize compound to the mounting bolt threads (recommended for future removal)
9	Install and tighten the mounting bolt(s) to factory torque specification
10	Lower the axle and remove the floor jack
11	Lower the vehicle from the jack stands
12	Repeat on the opposite side
13	Test drive over bumps – listen for clunks and feel for harsh bottoming-out

Q1: What is the purpose of the auxiliary spring bumper?

A: The auxiliary spring bumper (also called rebound bumper or bump stop) serves several critical functions:

Prevents metal-to-metal contact between the rear axle and chassis frame

Absorbs impact energy when the suspension fully compresses

Protects leaf springs from over-extension damage

Protects the chassis frame from impact damage

Reduces driver fatigue by cushioning harsh bottoming-out

Without this bumper, every large bump or heavy load causes the axle to slam into the frame, damaging both components.

Q2: How many bumpers does my truck need?

A: ISUZU medium-duty trucks require two rear leaf spring bumpers – one on the left (driver) side and one on the right (passenger) side. We recommend replacing both at the same time for balanced suspension performance.

Q3: What is the difference between an auxiliary spring and the main leaf spring?

A:

Main leaf springs – Primary suspension – supports the vehicle's weight continuously

Auxiliary spring bumper – Secondary cushion – only contacts during heavy compression (large bumps, heavy loads, bottoming-out)

Q4: How often should I replace rear leaf spring bumpers?

A: Inspection interval recommendations:

Every 12 months or 20,000 km – Visual inspection

Replace when any cracks, hardening, or compression is visible

Replace immediately if bumper is missing or separated from mounting plate

Auxiliary spring bumpers on delivery or construction trucks (frequent heavy loads) typically wear faster than highway fleet vehicles.

Q5: Will these fit my ISUZU NPR with dual rear wheels (DRW)?

A: Yes. The auxiliary spring bumper is the same for single rear wheel (SRW) and dual rear wheel (DRW) configurations on NPR, NKR, NQR, and 700P models equipped with rear leaf springs.

Q6: Can I drive with a broken or missing auxiliary spring bumper?

A: Not recommended. Driving without a functional bumper allows metal-to-metal contact between the axle and chassis frame, which can cause:

Bent or cracked chassis frame

Damaged leaf spring mounting brackets

Spring breakage

Extremely harsh ride quality

Possible structural failure

Replace a broken or missing bumper immediately.

Q7: Will replacing the bump stop improve ride quality?

A: Yes. If your current bump stop is cracked, compressed, or missing, you have likely been experiencing harsh bottoming-out over bumps. Installing a new, functional auxiliary spring bumper will significantly improve ride comfort, especially when the truck is loaded.

Q8: Do you offer wholesale pricing for bulk orders (fleet quantities)?

A: Yes. Please contact us with your quantity and preferred quality level for a competitive quote. Bulk discounts available for fleets, repair shops, and parts distributors.

 

 

 

 

 

 

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